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LM2715MT-ADJ Datasheet(PDF) 3 Page - National Semiconductor (TI) |
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LM2715MT-ADJ Datasheet(HTML) 3 Page - National Semiconductor (TI) |
3 / 22 page Pin Description (TSSOP) (Continued) Pin Name Function 9 SW NMOS power switch input. 10 V IN Main power input, step-up and switch circuitry. 11 SWI PMOS switch input. 12 SWO PMOS switch output. 13 SWC PMOS switch control pin. 14 AV IN Analog power input (buffers). 15 GMA Gamma buffer output. 16 GMA+ Gamma buffer input. Pin Description (LLP) Pin Name Function 1 Vcom- Vcom Amplifier negative input. 2 Vcom Vcom Amplifier output. 3 AGND Analog Ground. Connect to AGND plane. 4 Delay PMOS switch delay. 5V C Boost Compensation Network Connection. 6 FB Output Voltage Feedback input. 7 PGND Power Ground. Connect to PGND plane. 8 PGND Power Ground. Connect to PGND plane. 9 NC Not internally connected. Leave floating or connect to Ground. 10 NC Not internally connected. Leave floating or connect to Ground. 11 SW NMOS power switch input. 12 SW NMOS power switch input. 13 SW NMOS power switch input. 14 V IN Main power input, step-up and switch circuitry. 15 SWI PMOS switch input. 16 SWO PMOS switch output. 17 SWC PMOS switch control pin. 18 AV IN Analog power input (buffers). 19 GMA Gamma buffer output. 20 GMA+ Gamma buffer input. 21 NC Not internally connected. Leave floating or connect to Ground. 22 NC Not internally connected. Leave floating or connect to Ground. 23 NC Not internally connected. Leave floating or connect to Ground. 24 Vcom+ Vcom Amplifier positive input. DAP DAP Center Die Attach Pad. Connect directly to AGND and PGND pins beneath the device. Pin Functions Vcom+: Positive input terminal of Vcom amplifier. Vcom−: Negative input terminal of Vcom amplifier. Vcom: Output terminal of Vcom amplifier. AGND: Analog ground connection for LM2715. Connect all sensitive circuitry, ie. feedback resistors, delay capacitor, and compensation network to its own dedicated AGND plane which connects directly to this pin. Delay: PMOS switch delay control pin. See Operation sec- tion for setting the delay time. The delay time begins when the output voltage of the DC/DC switching regulator reaches 85% of its true output voltage. This corresponds to a FB voltage of about 1.1V. The PMOS switch is controlled with both the delay time and the switch control pin, SWC. If no Cdelay capacitor is used, the PMOS switch is controlled solely with the SWC pin. V C: Compensation Network for Boost switching regulator. Connect resistor/capacitor network between V C pin and AGND for boost switching regulator AC compensation. FB: Feedback pin. Set the output voltage by selecting values of R1 and R2 using: Connect the ground of the feedback network to the AGND plane, which should be tied directly to the PGND pin. www.national.com 3 |
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